The Importance of Hydrotesting Services in India: Safeguarding Your Hydrogen Cylinders

Hydrogen’s role is rising within the clean energy transition globally, and it is becoming a key element in India’s approach to clean energy via the ambition of creating green hydrogen through production, storage and distribution. With advancing technology comes increasing levels of success as well as risks; therefore, ensuring safe handling of hydrogen against accidents or failures within the hydrogen infrastructure becomes a priority now more than ever.

Cylinder hydrotesting is an important component in the overall safety practices needed to ensure the continued safe use, compliance and functionality of pressurised storage systems containing hydrogen gas.

Hydrogen must usually be stored at very high pressures (up to approx 408 bar or 6000 psi) in either cylinders or cascaded containers. Both types of hydrogen storage can withstand multiple usages and wear and tear caused by climate/weather conditions and physical/operational stress, and ultimately can have their structural integrity compromised over a period of time. Hydro-testing services help to provide safety assurance for every cylinder and storage unit, while also meeting legal compliance requirements.

In this comprehensive blog, we will highlight the importance of hydro-testing, how hydro-testing helps protect hydrogen infrastructure, how the hydro-testing process works, what regulatory frameworks apply specifically to manufacturers in India’s industrial gases industry, and provide supporting information that shows why hydro-testing is critical for any business associated with storing or handling hydrogen in either a cylinder cascade format or using other types of hydrogen storage systems.

What is Cylinder Hydrotesting?

Cylinder hydrotesting consists of verifying the integrity and pressure retention capacity of storage cylinders through water testing. The storage cylinders are filled with water and tested under pressure to failure.

In contrast to pneumatic testing, which utilises air or gas and can be dangerous due to air’s compressibility, hydrotesting uses water, which is also a nearly incompressible liquid. Thus, hydrotesting is significantly safer than pneumatic testing.

Overall Objectives of Hydrotesting

  • To validate that the combination of materials used within a storage cylinder can withstand significant volumes of pressurised material. 
  • To determine if a storage cylinder is leaking or has undergone permanent deformation. 
  • Ensure safety requirements are met, and extend the useful life of storage cylinders.


Hydrotesting is not only a good practice, but a requirement by law within India for all pressurised cylinders containing gases, including those used in hydrogen gas storage.

The Contribution of Hydrotesting Services in India

India has been inundated with the need for hydrogen-based infrastructure, including demand from various government agencies (e.g., the National Green Hydrogen Mission). Expansion of the hydrogen sector has resulted in greater demand for standard, reputable hydrotesting services in India.

Reputable hydrotesting facilities will provide:

  • Up-to-date technology, testing equipment, and facilities.
  • Technicians and inspectors who have been certified to perform hydrotesting.
  • Facilities and personnel comply with both Indian and international standards for hydrotesting.
  • Detailed certification of results.
 

Key industries requiring cylinder hydrotesting facilities include:

  • Oil and gas
  • Chemical manufacturing
  • Renewable energy
  • Automotive (hydrogen fuel cells)
  • Aerospace 
 

A complete and thorough testing process will ensure the longevity of all storage cylinders.

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Hydrogen Gas Cylinder Cascade & Hydrogen Gas Storage Systems

Hydrogen gas cylinder cascades are sometimes called hydrogen cascading, or simply hydrogen cages, due to the number of cylinders that are connected in a cylinder cascade. This allows for a greater volume of hydrogen to be used in an efficient manner for supply and storage within an industrial market.

Some characteristics of cylinder cascades are:

  1. High-Volume Hydrogen Storage
  2. Modular Design for Increased Scalability
  3. Efficiently Distributing Gas
  4. Mobility of Cylinders for Transportation Use
 

One key factor in the effective use of hydrogen in an industrial market is the increased risk of failure attributed to all the design characteristics associated with the configuration of a hydrogen gas cylinder cascade.

In general, hydrogen storage systems (mobile and stationary) have to follow federal guidelines regarding safety. Many times, these systems may be subjected to severe environmental conditions; therefore, it is imperative that both visual and pressure tests are done on a regular basis.

The testing that is conducted on each cylinder in a cascade is referred to as hydrotesting. Each cylinder must be hydrotested independently in order to verify that the overall system is tested in compliance with the required safety guidelines.

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The Hydrotesting Process: Step-by-Step

1. Visual Check

The first step prior to any test of the cylinder is to conduct a visual examination of the cylinder to find any visual damage (i.e., dents, corrosion, cracks).

2. Clean

The cylinder’s interior should be free from any contamination that could interfere with the results of the testing. Therefore, the interior should be cleaned.

3. Fill with Water

By filling the cylinder with water, you can eliminate the presence of any air pockets within the cylinder.

4. Pressure Test

The cylinder is subjected to a pressure greater than its normal operating pressure, using specialised equipment.

Measurement & Monitoring

Using an expansion measurement tool, measure the amount of expansion of the cylinder. Any permanent deformation of the cylinder is an indication of failure of the cylinder.

Leak Test

The system will check for leaks during the testing process.

Drying & Reassembly

After the testing is complete, dry the cylinder completely prior to reassembling it.

Certification

If the cylinder passes the above processes, the cylinder is stamped or labelled with the date of the test and the details of certification.

Regulatory Framework for Hydrotesting in India

There are strict regulations governing the testing and certification of gas cylinders in India. As such, authorities require that hydrotesting occur on a periodic basis to protect the safety of the public and of industry.

Regulatory Requirements

  • Regular cylinder testing is required (i.e., typically every 3 to 5 years)
  • The only facilities that have been authorised to conduct hydrotesting may do so.
  • All testing facilities and cylinders require proper certification and documentation.
  • Any non-compliant cylinders will be taken out of service. 
 

The above provisions have been established to minimise the risk associated with gas cylinder use.

Stay Compliant, Stay Safe!

Adhering to hydrotesting regulations isn’t optional; it’s essential. Ensure your cylinders meet all legal requirements and avoid costly penalties.

Benefits of Regular Cylinder Hydrotesting

Hydro-testing on a regular basis will provide the user with many benefits.

1. Increased Safety

The timely identification of any defect can prevent accidents and ensure that the cylinders are being used safely.

2. Longer Life of Cylinders

Timely hydrotesting and maintenance will help to prolong the usable life of cylinders.

3. Complying with Regulations

Failure to comply with mandated hydrotesting can lead to fines and the possibility of legal issues.

4. Operational Efficiencies

Cylinders that are properly maintained perform better and reduce downtime.

5. Savings

Preventing cylinder failures saves on repair and replacement costs.

Maintenance of Hydrogen Cylinders

Despite being a critical aspect of safety in the use of hydrogen cylinders, there are many challenges associated with maintaining hydrogen cylinders, including:

  • Lack of knowledge regarding requirements associated with hydrotesting
  • Limited availability of certified hydrotesting equipment and facilities in remote areas
  • High cost of hydrotesting and maintenance
  • Inconsistencies in following the safety standards of operation
 

Overcoming these challenges can only be accomplished through a combined effort among industry players, service providers, and regulatory agencies.

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Final Thoughts

he emergence of hydrogen as a renewable energy source has created many opportunities but has also created a lot of responsibility. Making sure that storage systems, e.g. cylinders and cascades, are safe is critical, and the foundation of this is cylinder hydrotesting.

 

Due to the increased demand for hydrotesting services across India, it is essential that all hydrogen infrastructures undergo regular hydrotesting, compliance and maintenance, and that all hydrogen-bearing systems undergo rigorous testing to prevent failures and to provide an alibi for use.

Safety is not a one-time thing, but rather, it is a continuous commitment. If we can use hydrotesting as standard practice, then we can continue our hydrogen efforts in India with the understanding that innovation is successfully coupled with responsibility.

Secure Your Hydrogen Future!

Don’t compromise on safety in the pursuit of progress. Invest in reliable hydrotesting services in India today and build a safer, stronger hydrogen ecosystem for tomorrow.

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